Sleeping with open or closed curtains

Sleeping with open or closed curtains - Sleep and curtains

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

NL-OMON

Registry ID

NL-OMON41249

Enrollment

100

Registered

2013-12-13

Start date

2013-02-14

Completion date

Unknown

Last updated

2024-04-23

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

sleep loss sleep loss sleep quality

Interventions

For 16 days sleeping with open curtains (if usually closed) or sleeping with closed curtains (if usually open).

Eligibility

Age

18 Years to 99 Years

Inclusion criteria

Inclusion criteria: Healthy men and women between 18 and 45 years of age Chronotype (MSFsc) of greater than 4 (meaning a sleep mid point at 04:00 a.m.) Social jetlag = difference between mid-sleep on workdays and days off of minimum 2 hours Habitual sleep duration on free days between 6 and 10 hours Bed partners agree to the study protocol Written informed consent

Exclusion criteria

Exclusion criteria: Sleep disorders, e.g. sleep apnoea, narcolepsy, restless legs, primary insomnia Mood disorder; because of the possibility of depressive mood as co morbidity in late chronotypes we will set the criterion for exclusion based on depressive mood on a BDI-II rating equal to or higher than 16 (indicating severe dysphoric or depressed mood) Two or more time zones crossed 1 month before study participation Shift-work during 5 years prior to participation Recent eye surgery (last year), glaucoma or other eye disease History of chronic diseases, and/or use of chronic medication for 3 months or longer before study participation Alcohol or drug problems (based on answers to the General Questionnaire) The use of sleep and photosensitizing medication

Design outcomes

Primary

Measure	Time frame
Sleep timing and sleep quantity from sleep diaries (subjective) and actimetry (objective; sub-group only).	—

Secondary

Measure	Time frame
Sleep quality from subjective sleep diaries, and light exposure assessed from sleep diaries. In addition, secondary objective parameter in this study in a sub-sample of 20 participants is melatonin concentration in saliva. The start of the rhythm will be measured: dim light melatonin onset (DLMO). A shift in DLMO is interpreted as a shift in the endogenous circadian pacemaker.	—

Countries

Netherlands

Outcome results

None listed

Source: NL-OMON (via WHO ICTRP)